Correlated valence fluctuation model for high-Tccopper oxide superconductors
- 20 August 1987
- journal article
- Published by IOP Publishing in Journal of Physics C: Solid State Physics
- Vol. 20 (23) , L571-L576
- https://doi.org/10.1088/0022-3719/20/23/010
Abstract
A simple correlated valence fluctuation model is proposed as a possible mechanism for high-Tc superconductivity in certain copper oxides. Electron pairs are formed by Coulomb attraction between electrons in mainly Cu2+ (d9 configuration) pyramidal planes mediated by Cu3+ (d8 configuration) ions in the CuO4 chain-like plane in YBa2Cu3O7-x. These electron pairs have high binding energies necessary for high Tc, and the model is capable of explaining a number of other observed properties.Keywords
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